Saying the words that come from knowledge is no sign of having it.

To leave the number of births unrestricted, as is done in most states, inevitably causes poverty among the citizens, and poverty produces crime and faction.

Wit is educated insolence.

It is the mark of an educated mind to expect that amount of exactness which the nature of the particular subject admits. It is equally unreasonable to accept merely probable conclusions from a mathematician and to demand strict demonstration from an orator.

My best friend is the man who in wishing me well wishes it for my sake.

Music directly represents the passions of the soul. If one listens to the wrong kind of music, he will become the wrong kind of person.

... the science we are after is not about mathematicals either none of them, you see, is separable.